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. 2020 Nov 25;2(4):502–522. doi: 10.3390/clockssleep2040037

Figure 3.

Figure 3

Mood, sleepiness and performance during a simulated night shift in long-wavelength narrow-bandwidth light (red bars) and short-wavelength narrow-bandwidth light (blue bars). The bars represent estimated marginal means with error bars indicating standard error. (A) Positive mood assessed with the Positive and Negative Affect Schedule (PANAS). (B) Negative mood assessed with PANAS. (C) Subjective sleepiness assessed with the Karolinska Sleepiness Scale (KSS). (D) Reciprocal response times (mean 1/RT) on the Psychomotor Vigilance Task (PVT). (E) RTs excluding lapses (mean RT500) on the PVT. (F) Number of lapses (RTs ≥ 500 ms) on the PVT. (G) Number of correct responses on the Digit Symbol Substitution Test (DSST). Significant differences indicated for variables with a significant Light by Time interaction only. Number symbols (#) indicate significant difference compared to the first test bout (23:30 h), and asterix symbols (*) indicate significant difference between light conditions. ##; ** = p < 0.01, ###; *** = p < 0.001.